US20110210097A1 - Machine and method for forming a metal mesh - Google Patents

Machine and method for forming a metal mesh Download PDF

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Publication number
US20110210097A1
US20110210097A1 US13/128,343 US200913128343A US2011210097A1 US 20110210097 A1 US20110210097 A1 US 20110210097A1 US 200913128343 A US200913128343 A US 200913128343A US 2011210097 A1 US2011210097 A1 US 2011210097A1
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US
United States
Prior art keywords
electrodes
wires
welding
welded
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/128,343
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English (en)
Inventor
Ermanno Taboga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MEP Macchine Elettroniche Piegatrici SpA
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MEP Macchine Elettroniche Piegatrici SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MEP Macchine Elettroniche Piegatrici SpA filed Critical MEP Macchine Elettroniche Piegatrici SpA
Assigned to M.E.P. MACCHINE ELETTRONICHE PIEGATRICI SPA reassignment M.E.P. MACCHINE ELETTRONICHE PIEGATRICI SPA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TABOGA, ERMANNO
Publication of US20110210097A1 publication Critical patent/US20110210097A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • B23K11/008—Manufacturing of metallic grids or mats by spot welding
    • B23K11/0086—Grids or mats used in concrete structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/22—Nets, wire fabrics or the like

Definitions

  • the present invention concerns a machine for forming one or more metal meshes, by means of welding.
  • the invention is applied, preferably but not exclusively, to making electro-welded metal meshes used as reinforcements in reinforced concrete structures. For this reason, in the following description, specific reference will be made to this application, even though the invention can also be used for forming meshes of other types.
  • Machines for producing electro-welded metal meshes are known, which meshes are made from a plurality of longitudinal metal wires or round pieces, distanced with respect to each other. Corresponding metal transverse wires or round pieces are welded perpendicularly to the longitudinal wires, according to a predefined interaxis.
  • Such machines generally comprise a welding unit provided with a plurality of welders, at least one for every longitudinal wire, and a unit to feed the transverse wires.
  • each welder comprises two electrodes, an upper and a lower one, able to be brought selectively nearer to each other so as to be moved between a first position for feeding the wires to be welded, in which at least one of the two electrodes is moved away from the two wires so as to allow them to be positioned, and a second welding position in which the electrodes are brought into contact with and grip the two wires in correspondence with one of their join sections. In the second position the two electrodes close the electric circuit, thus welding the two wires.
  • transverse wire in some cases several transverse wires at the same time, is fed and disposed in an attachment position in which it is welded to the longitudinal wires by means of a relative welding unit.
  • the longitudinal wires are simultaneously made to move forward by a pitch equivalent to the interaxis according to specifications between the transverse wires, so that a new transverse wire can be fed and disposed in the attachment position.
  • the welders having a distance equal to the pitch required are electrically connected in pairs to each other by means of electric bridges. In this way, when the electrodes of each of said pairs are in the welding position, a closed electric circuit which allows the passage of the current needed for welding is formed for each of them.
  • the pitch is therefore made either by means of a single welder, that is, a pair of an upper and a lower electrode, or by means of a plurality of welded pairs connected to each other for the passage of the current.
  • Document U.S. Pat. No. 3,053,972 describes a feeding system for electrodes of the three-phase type, in which two upper electrodes are connected to two distinct phases of the three-phase system, while the third phase feeds a copper bar which acts as a lower electrode.
  • Document GB-A-1.056.005 also shows a three-phase feeding system in which pairs of electrodes are fed in distinct phases of the three-phase system, but no indication is provided for the possibility of modifying the pitch of the mesh, that is, of varying the activation of at least some of the electrodes, thus guaranteeing that a balanced electric feed is maintained in any case.
  • Purpose of the present invention is to make a machine for forming a metal mesh which does not need complex and laborious operations of equipping and calibrating the machine, and allows to make meshes substantially of any shape and size quickly, easily and substantially automatically, considerably reducing the setting times.
  • purpose of the invention is to reduce drastically the re-equipping times of the machine in the steps of modifying the pitch between the longitudinal wires, thus eliminating in practice the need to intervene with operations to assemble/disassemble mechanical parts in order to make the electric connection between specific welding units activated, and in any case keeping the electric feed perfectly balanced.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a machine according to the present invention is used, advantageously but not exclusively, to make a metal mesh of the electro-welded type comprising longitudinal and transverse wires.
  • the machine comprises a plurality of welding units, each consisting of a pair of electrodes, by means of which the longitudinal wires are attached by welding, with a pre-defined or pre-definable pitch, to corresponding transverse wires of the metal mesh.
  • the two electrodes, respectively upper and lower, of each pair are selectively and reciprocally movable between a first distanced position in order to feed the wires to be welded, in which at least one of the electrodes is distant from the two wires to be welded, and a second welding position in which both the electrodes contact and weld the two wires by means of the passage of current.
  • the upper electrodes are fixed and the lower electrodes are movable, or also that both electrodes are movable to be reciprocally closer/distanced with respect to each other.
  • the upper and lower electrodes are disposed in pairs respectively facing each other, and longitudinally distanced according to a regular interaxis equal to the minimum pitch of the mesh to be obtained.
  • the welding unit is electrically fed by a three-phase system, in which at least the lower electrodes of the welders are each individually connected to a specific phase of the three-phase system.
  • the feed configuration of the lower electrodes is such that, as the required pitch of the mesh varies, and therefore that of the upper electrodes activated and brought into contact with the wires to be welded, the electric circuit between the upper electrode, the wires to be welded and the lower electrode of a triad of lower electrodes longitudinally adjacent is closed in such a manner that all three phases of the three-phase system to which the lower electrodes are connected are present, so as to guarantee a balanced electric feed.
  • the upper electrode involved in the welding even as the pitch varies, always forms with another two adjacent upper electrodes and with the relative and corresponding lower electrodes, sequential triads in which all three phases of the three-phase system of electric feed are present.
  • connection of the lower and upper electrodes follows a configuration of the star type of the three-phase system.
  • the upper electrodes of the welders are all connected to the centre of said star, and the star is in any case formed by triads that vary as the electrodes involved vary, depending on the desired pitch of the mesh to be made.
  • FIG. 1 is a front view of a welding machine according to the present invention in a first operating condition
  • FIG. 2 is a detail of FIG. 1 ;
  • FIG. 3 is a front view of the machine in FIG. 1 in a second operating condition
  • FIG. 4 is a front view of the machine in FIG. 1 in a third operating condition
  • FIGS. 5 a , 5 b , 5 c and 5 d schematically show different configurations of use of the machine according to the invention, respectively with the upper electrodes raised to feed the wires to be welded, with all the upper electrodes lowered to obtain the mesh with minimum pitch, and with some of the upper electrodes lowered to obtain, respectively, a double pitch ( FIG. 5 c ) and triple pitch ( FIG. 5 d ) of the minimum pitch.
  • number 10 indicates in its entirety a machine for forming electro-welded meshes according to the present invention.
  • the electro-welded meshes formed with the machine 10 comprise a plurality of longitudinal metal wires 12 distanced from each other and welded to corresponding transverse metal wires 13 , also distanced by a pre-defined interaxis.
  • the machine 10 substantially comprises a frame 11 and at least a welding unit 17 , mounted on the frame 11 .
  • a welding unit 17 is shown comprising a plurality of welders 14 , one adjacent to the other.
  • the welders 14 can also be moved in a direction substantially parallel to the direction of feed of the transverse wires 13 .
  • the machine 10 also comprises a longitudinal feed unit and a transverse feed unit, not shown, respectively able to feed the longitudinal wires 12 and the transverse wires 13 , to dispose them in cooperation with the welders 14 .
  • Each welder 14 is disposed in correspondence with the join zone between the respective longitudinal wire 12 and the relative transverse wire 13 , and comprises a first upper electrode 15 and a second lower electrode 16 .
  • the electrodes 15 , 16 electrically fed, allow to close, as will be described more fully hereafter, an electric circuit and therefore the passage of a current in correspondence with the wires 12 and 13 , thus determining the welding thereof.
  • Each upper electrode 15 is selectively movable vertically in the direction of the second electrode 16 , which is fixed, and the transverse wire 13 and the longitudinal wire 12 are able to be positioned on the latter in their join position.
  • the invention is also applied in the case where the upper electrode 15 is fixed and the lower electrode 16 is selectively movable.
  • the first electrode 15 is selectively movable between a first feed position (see for example the position of the upper electrodes in FIG. 5 a ), in which it is raised and distanced from the second electrode 16 and allows the free feed both of the transverse wire 13 and also of the longitudinal wire 12 , and a second welding position, in which it is near to the second electrode 16 and with the latter contacts the two wires 12 and 13 (see FIGS. 5 b , 5 c and 5 d discussed in detail hereafter).
  • a first feed position see for example the position of the upper electrodes in FIG. 5 a
  • a second welding position in which it is near to the second electrode 16 and with the latter contacts the two wires 12 and 13
  • the welding unit 17 is fed electrically by means of a three-phase system in the known star type configuration, in which all the upper electrodes 15 of the welders 14 are connected to the star's centre and the lower electrodes 16 of the welders 14 are connected to different phases, indicated in the drawings with the letters R, S, T of the three-phase system.
  • each lower electrode 16 is connected to a respective phase R, S, T of the three-phase feed system.
  • the welders 14 of each triad 18 are distanced longitudinally with respect to each other by a quantity equal to the minimum pitch desired between the longitudinal wires 12 .
  • the minimum pitch of the metal mesh is obtained, which can correspond, for example, to 50 mm.
  • the machine 10 can however assume different operating conditions, each corresponding to the production of meshes having different pitches between the longitudinal wires 12 and the transverse wires 13 .
  • the lower electrodes 16 of the welders 14 continue to form triads of adjacent electrodes, in relation to the respective upper electrodes 15 activated, which comprise all the three phases R, S, T (even if not in the same order), thus ensuring the closure of the circuit in balanced feed conditions.
  • the first three lower electrodes 16 form in sequence a triad R, S, T
  • the second three electrodes form a triad T
  • S, R the third three electrodes 16 form a triad S, R, T, and so on, that is, adjacent triads of lower electrodes 16 always and in every case comprise all the phases of a triad.
  • the first three lower electrodes 16 form the triad R, T, S
  • the second three lower electrodes 16 form the triad S, T, R
  • each triad 18 of adjacent lower electrodes 16 associated with the upper electrodes 15 activated, always comprises all the three phases R, S, and T.
  • machine 10 functions as follows.
  • the upper electrodes 15 are moved into a welding position having a reciprocal distance equal to said pitch.
  • each lower electrode 16 of each welder 14 of said triads 18 is connected to a different phase R, S, T of the three-phase system.
  • the upper electrodes 15 of the triads 18 are electrically connected to the respective lower electrodes 16 . Therefore the upper electrodes 15 of said triads 18 are in short circuit with the respective lower electrodes 16 . This corresponds to short circuit each phase of the three phase system with the star centre. The three-phase system of each triad 18 is therefore short circuited. Consequently, for each of said triads 18 , a closed circuit is formed through which the current needed to weld the wires 12 , 13 flows.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wire Processing (AREA)
  • Resistance Welding (AREA)
  • Arc Welding In General (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
US13/128,343 2008-11-07 2009-11-06 Machine and method for forming a metal mesh Abandoned US20110210097A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITUD2008A000233A IT1391697B1 (it) 2008-11-07 2008-11-07 Macchina per la formazione di rete metallica e relativo gruppo di saldatura
ITUD2008A000233 2008-11-07
PCT/IB2009/007371 WO2010052562A2 (en) 2008-11-07 2009-11-06 Machine for forming a metal mesh and relative welding unit

Publications (1)

Publication Number Publication Date
US20110210097A1 true US20110210097A1 (en) 2011-09-01

Family

ID=41050841

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/128,343 Abandoned US20110210097A1 (en) 2008-11-07 2009-11-06 Machine and method for forming a metal mesh

Country Status (12)

Country Link
US (1) US20110210097A1 (da)
EP (1) EP2352614B1 (da)
CN (1) CN102209603B (da)
BR (1) BRPI0921708A2 (da)
DK (1) DK2352614T3 (da)
ES (1) ES2934081T3 (da)
FI (1) FI2352614T3 (da)
HU (1) HUE060896T2 (da)
IT (1) IT1391697B1 (da)
PL (1) PL2352614T3 (da)
PT (1) PT2352614T (da)
WO (1) WO2010052562A2 (da)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1392866B1 (it) * 2009-02-20 2012-04-02 Schnell Spa Metodo e apparecchiatura per realizzare armature per cemento armato
KR101382319B1 (ko) * 2012-12-17 2014-04-08 현대자동차 주식회사 트윈 스폿 용접장치
CN104475957B (zh) * 2014-12-15 2016-08-24 天津市科华焊接设备有限公司 具有多个电极同时压下单个电极分别焊接的焊网机

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878760A (en) * 1927-12-19 1932-09-20 Hume Steel Ltd Method of and apparatus for use in the manufacture of metallic meshing, netting, andlike fabric
US3053972A (en) * 1960-05-18 1962-09-11 Standard Pressed Steel Co Resistance welding
GB1056005A (en) * 1965-04-13 1967-01-25 Evg Entwicklung Verwert Ges Improvements in multipoint mesh welding machines
US3424888A (en) * 1965-09-28 1969-01-28 Evg Entwicklung Verwert Ges Electric current feeding device for resistance welding
US3497659A (en) * 1966-04-07 1970-02-24 Evg Entwicklung Verwert Ges Method of sequentially manufacturing wire meshes having different transverse wire spacings
US3592998A (en) * 1968-03-27 1971-07-13 Metallurg Hainaut Sambre Sa So Process for resistance welding elements having different masses
US3611352A (en) * 1968-02-16 1971-10-05 Evg Entwicklung Verwert Ges Device for automatically, or semiautomatically, changing the length of stroke of the grating advance mechanism in welding machines for welding wire gratings
US3732899A (en) * 1971-09-03 1973-05-15 W Schindler Apparatus for determining the gauge of wire screen or mesh
US4468550A (en) * 1981-07-28 1984-08-28 Evg Entwicklungs-Und Verwertungs-Gesellschaft Mbh. Multispotwelding machine for the production of grids or gratings
US4496820A (en) * 1982-12-14 1985-01-29 Evg Entwicklungs- Und Verwertungs-Gesellschaft M.B.H. Multispot electrical resistance welding machine
US4539457A (en) * 1982-12-07 1985-09-03 Staco Stapelmann Gmbh Method of manufacturing gratings and apparatus for carrying out the method
US4667707A (en) * 1984-04-24 1987-05-26 Sismo International Method for assembling three-dimensional metal structures, machine for the manufacturing thereof, and structures obtained with such a method
US5313040A (en) * 1992-03-23 1994-05-17 Mazda Motor Corporation Multi-unit welding apparatus
US5416288A (en) * 1992-11-11 1995-05-16 H. A. Schlatter Ag. Multiple spot resistance welding machine for welding wire grids

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1785569B (zh) * 2005-01-14 2010-11-17 哈尔滨银河焊接机械研究所 一种钢格栅板的压焊方法和设备
CN100363141C (zh) * 2005-12-09 2008-01-23 新兴铸管股份有限公司 钢格板压焊机

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878760A (en) * 1927-12-19 1932-09-20 Hume Steel Ltd Method of and apparatus for use in the manufacture of metallic meshing, netting, andlike fabric
US3053972A (en) * 1960-05-18 1962-09-11 Standard Pressed Steel Co Resistance welding
GB1056005A (en) * 1965-04-13 1967-01-25 Evg Entwicklung Verwert Ges Improvements in multipoint mesh welding machines
US3424888A (en) * 1965-09-28 1969-01-28 Evg Entwicklung Verwert Ges Electric current feeding device for resistance welding
US3497659A (en) * 1966-04-07 1970-02-24 Evg Entwicklung Verwert Ges Method of sequentially manufacturing wire meshes having different transverse wire spacings
US3611352A (en) * 1968-02-16 1971-10-05 Evg Entwicklung Verwert Ges Device for automatically, or semiautomatically, changing the length of stroke of the grating advance mechanism in welding machines for welding wire gratings
US3592998A (en) * 1968-03-27 1971-07-13 Metallurg Hainaut Sambre Sa So Process for resistance welding elements having different masses
US3732899A (en) * 1971-09-03 1973-05-15 W Schindler Apparatus for determining the gauge of wire screen or mesh
US4468550A (en) * 1981-07-28 1984-08-28 Evg Entwicklungs-Und Verwertungs-Gesellschaft Mbh. Multispotwelding machine for the production of grids or gratings
US4539457A (en) * 1982-12-07 1985-09-03 Staco Stapelmann Gmbh Method of manufacturing gratings and apparatus for carrying out the method
US4496820A (en) * 1982-12-14 1985-01-29 Evg Entwicklungs- Und Verwertungs-Gesellschaft M.B.H. Multispot electrical resistance welding machine
US4667707A (en) * 1984-04-24 1987-05-26 Sismo International Method for assembling three-dimensional metal structures, machine for the manufacturing thereof, and structures obtained with such a method
US5313040A (en) * 1992-03-23 1994-05-17 Mazda Motor Corporation Multi-unit welding apparatus
US5416288A (en) * 1992-11-11 1995-05-16 H. A. Schlatter Ag. Multiple spot resistance welding machine for welding wire grids

Also Published As

Publication number Publication date
ITUD20080233A1 (it) 2010-05-08
CN102209603A (zh) 2011-10-05
BRPI0921708A2 (pt) 2018-06-05
EP2352614B1 (en) 2022-10-05
CN102209603B (zh) 2014-03-12
WO2010052562A3 (en) 2010-07-01
ES2934081T3 (es) 2023-02-16
PT2352614T (pt) 2022-12-20
DK2352614T3 (da) 2022-12-19
IT1391697B1 (it) 2012-01-17
EP2352614A2 (en) 2011-08-10
FI2352614T3 (fi) 2023-01-13
HUE060896T2 (hu) 2023-04-28
PL2352614T3 (pl) 2023-01-23
WO2010052562A2 (en) 2010-05-14

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AS Assignment

Owner name: M.E.P. MACCHINE ELETTRONICHE PIEGATRICI SPA, ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TABOGA, ERMANNO;REEL/FRAME:026256/0496

Effective date: 20110429

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION